package com.ipworkbench.common.util;
import java.lang.reflect.*;




/**
 * md5加密处理类
 * 
 * @author Administrator
 *
 */
public class MD5 {
	

    static final int S11 = 7;
    static final int S12 = 12;
    static final int S13 = 17;
    static final int S14 = 22;

    static final int S21 = 5;
    static final int S22 = 9;
    static final int S23 = 14;
    static final int S24 = 20;

    static final int S31 = 4;
    static final int S32 = 11;
    static final int S33 = 16;
    static final int S34 = 23;

    static final int S41 = 6;
    static final int S42 = 10;
    static final int S43 = 15;
    static final int S44 = 21;

    static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
    /* 涓嬮潰鐨勪笁涓垚鍛樻槸MD5璁＄畻杩囩▼涓敤鍒扮殑3涓牳蹇冩暟鎹紝鍦ㄥ師濮嬬殑C瀹炵幇涓�
       琚畾涔夊埌MD5_CTX缁撴瀯涓�

     */
    private long[] state = new long[4];  // state (ABCD)
    private long[] count = new long[2];  // number of bits, modulo 2^64 (lsb first)
    private byte[] buffer = new byte[64]; // input buffer

/* digestHexStr鏄疢D5鐨勫敮涓�竴涓叕鍏辨垚鍛橈紝鏄渶鏂颁竴娆¤绠楃粨鏋滅殑
銆�16杩涘埗ASCII琛ㄧず.
*/
    public String digestHexStr;

    /* digest,鏄渶鏂颁竴娆¤绠楃粨鏋滅殑2杩涘埗鍐呴儴琛ㄧず锛岃〃绀�28bit鐨凪D5鍊�
*/
    private byte[] digest = new byte[16];

/*
  getMD5ofStr鏄被MD5鏈�富瑕佺殑鍏叡鏂规硶锛屽叆鍙ｅ弬鏁版槸浣犳兂瑕佽繘琛孧D5鍙樻崲鐨勫瓧绗︿覆
  杩斿洖鐨勬槸鍙樻崲瀹岀殑缁撴灉锛岃繖涓粨鏋滄槸浠庡叕鍏辨垚鍛榙igestHexStr鍙栧緱鐨勶紟
*/
    public  String getMD5ofStr(String inbuf) {
            md5Init();
            md5Update(inbuf.getBytes(), inbuf.length());
            md5Final();
            digestHexStr = "";
            for (int i = 0; i < 16; i++) {
                    digestHexStr += byteHEX(digest[i]);
            }
            return digestHexStr;

    }
    // 杩欐槸MD5杩欎釜绫荤殑鏍囧噯鏋勯�鍑芥暟锛孞avaBean瑕佹眰鏈変竴涓猵ublic鐨勫苟涓旀病鏈夊弬鏁扮殑鏋勯�鍑芥暟
    public MD5() {
            md5Init();

            return;
    }



    /* md5Init鏄竴涓垵濮嬪寲鍑芥暟锛屽垵濮嬪寲鏍稿績鍙橀噺锛岃鍏ユ爣鍑嗙殑骞绘暟 */
    private void md5Init() {
            count[0] = 0L;
            count[1] = 0L;
            ///* Load magic initialization constants.

            state[0] = 0x67452301L;
            state[1] = 0xefcdab89L;
            state[2] = 0x98badcfeL;
            state[3] = 0x10325476L;

            return;
    }
    /* F, G, H ,I 鏄�涓熀鏈殑MD5鍑芥暟锛屽湪鍘熷鐨凪D5鐨凜瀹炵幇涓紝鐢变簬瀹冧滑鏄�
    绠�崟鐨勪綅杩愮畻锛屽彲鑳藉嚭浜庢晥鐜囩殑鑰冭檻鎶婂畠浠疄鐜版垚浜嗗畯锛屽湪java涓紝鎴戜滑鎶婂畠浠�
 銆��瀹炵幇鎴愪簡private鏂规硶锛屽悕瀛椾繚鎸佷簡鍘熸潵C涓殑銆�*/

    private long F(long x, long y, long z) {
            return (x & y) | ((~x) & z);

    }
    private long G(long x, long y, long z) {
            return (x & z) | (y & (~z));

    }
    private long H(long x, long y, long z) {
            return x ^ y ^ z;
    }

    private long I(long x, long y, long z) {
            return y ^ (x | (~z));
    }

   /*
      FF,GG,HH鍜孖I灏嗚皟鐢‵,G,H,I杩涜杩戜竴姝ュ彉鎹�
      FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
      Rotation is separate from addition to prevent recomputation.
   */

    private long FF(long a, long b, long c, long d, long x, long s,
            long ac) {
            a += F (b, c, d) + x + ac;
            a = ((int) a << s) | ((int) a >>> (32 - s));
            a += b;
            return a;
    }

    private long GG(long a, long b, long c, long d, long x, long s,
            long ac) {
            a += G (b, c, d) + x + ac;
            a = ((int) a << s) | ((int) a >>> (32 - s));
            a += b;
            return a;
    }
    private long HH(long a, long b, long c, long d, long x, long s,
            long ac) {
            a += H (b, c, d) + x + ac;
            a = ((int) a << s) | ((int) a >>> (32 - s));
            a += b;
            return a;
    }
    private long II(long a, long b, long c, long d, long x, long s,
            long ac) {
            a += I (b, c, d) + x + ac;
            a = ((int) a << s) | ((int) a >>> (32 - s));
            a += b;
            return a;
    }
    /*
     md5Update鏄疢D5鐨勪富璁＄畻杩囩▼锛宨nbuf鏄鍙樻崲鐨勫瓧鑺備覆锛宨nputlen鏄暱搴︼紝杩欎釜
     鍑芥暟鐢眊etMD5ofStr璋冪敤锛岃皟鐢ㄤ箣鍓嶉渶瑕佽皟鐢╩d5init锛屽洜姝ゆ妸瀹冭璁℃垚private鐨�
    */
    private void md5Update(byte[] inbuf, int inputLen) {

            int i, index, partLen;
            byte[] block = new byte[64];
            index = (int)(count[0] >>> 3) & 0x3F;
            // /* Update number of bits */
            if ((count[0] += (inputLen << 3)) < (inputLen << 3))
                    count[1]++;
            count[1] += (inputLen >>> 29);

            partLen = 64 - index;

            // Transform as many times as possible.
            if (inputLen >= partLen) {
                    md5Memcpy(buffer, inbuf, index, 0, partLen);
                    md5Transform(buffer);

                    for (i = partLen; i + 63 < inputLen; i += 64) {

                            md5Memcpy(block, inbuf, 0, i, 64);
                            md5Transform (block);
                    }
                    index = 0;

            } else

                    i = 0;

            ///* Buffer remaining input */
            md5Memcpy(buffer, inbuf, index, i, inputLen - i);

    }

    /*
      md5Final鏁寸悊鍜屽～鍐欒緭鍑虹粨鏋�
    */
    private void md5Final () {
            byte[] bits = new byte[8];
            int index, padLen;

            ///* Save number of bits */
            Encode (bits, count, 8);

            ///* Pad out to 56 mod 64.
            index = (int)(count[0] >>> 3) & 0x3f;
            padLen = (index < 56) ? (56 - index) : (120 - index);
            md5Update (PADDING, padLen);

            ///* Append length (before padding) */
            md5Update(bits, 8);

            ///* Store state in digest */
            Encode (digest, state, 16);

    }

    /* md5Memcpy鏄竴涓唴閮ㄤ娇鐢ㄧ殑byte鏁扮粍鐨勫潡鎷疯礉鍑芥暟锛屼粠input鐨刬npos寮�鎶妉en闀垮害鐨�
銆�瀛楄妭鎷疯礉鍒皁utput鐨刼utpos浣嶇疆寮�
    */

    private void md5Memcpy (byte[] output, byte[] input,
            int outpos, int inpos, int len)
    {
            int i;

            for (i = 0; i < len; i++)
                    output[outpos + i] = input[inpos + i];
    }

    /*
       md5Transform鏄疢D5鏍稿績鍙樻崲绋嬪簭锛屾湁md5Update璋冪敤锛宐lock鏄垎鍧楃殑鍘熷瀛楄妭
    */
    private void md5Transform (byte block[]) {
            long a = state[0], b = state[1], c = state[2], d = state[3];
            long[] x = new long[16];

            Decode (x, block, 64);

            /* Round 1 */
            a = FF (a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
            d = FF (d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
            c = FF (c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
            b = FF (b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
            a = FF (a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
            d = FF (d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
            c = FF (c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
            b = FF (b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
            a = FF (a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
            d = FF (d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
            c = FF (c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
            b = FF (b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
            a = FF (a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
            d = FF (d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
            c = FF (c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
            b = FF (b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */

            /* Round 2 */
            a = GG (a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
            d = GG (d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
            c = GG (c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
            b = GG (b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
            a = GG (a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
            d = GG (d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
            c = GG (c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
            b = GG (b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
            a = GG (a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
            d = GG (d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
            c = GG (c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
            b = GG (b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
            a = GG (a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
            d = GG (d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
            c = GG (c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
            b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */

            /* Round 3 */
            a = HH (a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
            d = HH (d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
            c = HH (c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
            b = HH (b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
            a = HH (a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
            d = HH (d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
            c = HH (c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
            b = HH (b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
            a = HH (a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
            d = HH (d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
            c = HH (c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
            b = HH (b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
            a = HH (a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
            d = HH (d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
            c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
            b = HH (b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */

            /* Round 4 */
            a = II (a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
            d = II (d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
            c = II (c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
            b = II (b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
            a = II (a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
            d = II (d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
            c = II (c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
            b = II (b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
            a = II (a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
            d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
            c = II (c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
            b = II (b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
            a = II (a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
            d = II (d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
            c = II (c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
            b = II (b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */

            state[0] += a;
            state[1] += b;
            state[2] += c;
            state[3] += d;

    }

    /*Encode鎶妉ong鏁扮粍鎸夐『搴忔媶鎴恇yte鏁扮粍锛屽洜涓簀ava鐨刲ong绫诲瀷鏄�4bit鐨勶紝
      鍙媶浣�2bit锛屼互閫傚簲鍘熷C瀹炵幇鐨勭敤閫�
    */
    private void Encode (byte[] output, long[] input, int len) {
            int i, j;

            for (i = 0, j = 0; j < len; i++, j += 4) {
                    output[j] = (byte)(input[i] & 0xffL);
                    output[j + 1] = (byte)((input[i] >>> 8) & 0xffL);
                    output[j + 2] = (byte)((input[i] >>> 16) & 0xffL);
                    output[j + 3] = (byte)((input[i] >>> 24) & 0xffL);
            }
    }

    /*Decode鎶奲yte鏁扮粍鎸夐『搴忓悎鎴愭垚long鏁扮粍锛屽洜涓簀ava鐨刲ong绫诲瀷鏄�4bit鐨勶紝
      鍙悎鎴愪綆32bit锛岄珮32bit娓呴浂锛屼互閫傚簲鍘熷C瀹炵幇鐨勭敤閫�
    */
    private void Decode (long[] output, byte[] input, int len) {
            int i, j;


            for (i = 0, j = 0; j < len; i++, j += 4)
                    output[i] = b2iu(input[j]) |
                            (b2iu(input[j + 1]) << 8) |
                            (b2iu(input[j + 2]) << 16) |
                            (b2iu(input[j + 3]) << 24);

            return;
    }

    /*
      b2iu鏄垜鍐欑殑涓�釜鎶奲yte鎸夌収涓嶈�铏戞璐熷彿鐨勫師鍒欑殑锛傚崌浣嶏紓绋嬪簭锛屽洜涓簀ava娌℃湁unsigned杩愮畻
    */
    public static long b2iu(byte b) {
            return b < 0 ? b & 0x7F + 128 : b;
    }

/*byteHEX()锛岀敤鏉ユ妸涓�釜byte绫诲瀷鐨勬暟杞崲鎴愬崄鍏繘鍒剁殑ASCII琛ㄧず锛�
銆�洜涓簀ava涓殑byte鐨則oString鏃犳硶瀹炵幇杩欎竴鐐癸紝鎴戜滑鍙堟病鏈塁璇█涓殑
  sprintf(outbuf,"%02X",ib)
*/
    public static String byteHEX(byte ib) {
            char[] Digit = { '0','1','2','3','4','5','6','7','8','9',
            'A','B','C','D','E','F' };
            char [] ob = new char[2];
            ob[0] = Digit[(ib >>> 4) & 0X0F];
            ob[1] = Digit[ib & 0X0F];
            String s = new String(ob);
            return s;
    }

    public static void main(String args[]) {


            MD5 m = new MD5();
            System.out.println("fff:"+m.getMD5ofStr("aaa"));
            if (Array.getLength(args) == 0) {   //濡傛灉娌℃湁鍙傛暟锛屾墽琛屾爣鍑嗙殑Test Suite

                   	System.out.println("MD5 Test suite:");
            	System.out.println("MD5(\"\"):"+m.getMD5ofStr(""));
            	System.out.println("MD5(\"a\"):"+m.getMD5ofStr("a"));
            	System.out.println("MD5(\"abc\"):"+m.getMD5ofStr("abc"));
            	System.out.println("MD5(\"message digest\"):"+m.getMD5ofStr("message digest"));
            	System.out.println("MD5(\"abcdefghijklmnopqrstuvwxyz\"):"+
                    m.getMD5ofStr("abcdefghijklmnopqrstuvwxyz"));
            	System.out.println("MD5(\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\"):"+
                 	m.getMD5ofStr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"));
            }
            else
                  	System.out.println("MD5(" + args[0] + ")=" + m.getMD5ofStr(args[0]));


    }
}

